Grinding mechanism



sept. 13, 1932. F. J. JESCHKE 1,877,328

GRINDING MECHANISM Filed Feb. 5. 1931 2 Sheets-Shee l www v 5 1N VEN TOR.

Flinn/r CL. c/esc/fe ATTRNEYS Sept. 13, 1932. F. J. JESCHKE 1,877,328

GRINDING MECHANISM Filed Feb. 5, 1931 2 Sheets-Sheet 2 INVENTOR.

Ham/f E/escke ATTORNEYS FRANK .T.' anscnxn, or. j v

,. rounder DETROIT, MICHIGAN Patented Sept. 13, 1932 Drfrnorr, MICHIGAN, AssIGNoR or ONE-HALF To JAMES i.

GRINDING- MECHANISM i Application alea rebruary 5.1931. seria1;No.f513,`4a4.

f invention relates to'y an improved grinding tool. It is here shown as embodied in a grinding device particularly adapted for re.

boring'worn cylinders or for the boreina cylinder. i j ,i l j v Anobject is the provisionofagrinding tool of the character described so constructed that the` grinding elements' or abrasives `may be quickly and easily adjusted to an increased diameter to take care of wear andV to perform l the; desired grinding operation. .The construction islsuch that mechanism is. provided to adjustablyvary .the grinding diameter established by the grinding elements ,during the grinding operation and as theretofore determined. j.

A feature o f importance isthe provision of means operable to automatically exert a force during thegrinding loperation to feed thev abrasive elementsjoutwardly to an increased diameter according to a predetermined desired setting and which meansispreferably responsive to the initial impulse of rotation of grinding to be set; or tensionedto produce this adjustable variation of they grindingelements duringthe grinding operation. j Theadjustable mechanism isof such acharfV acter thattheuextent of..outward movement ofthe grinding `elements may. be -.determined and set and then upon the initial impulseA of rotation the adjustment `mechanism is tenf sioned to feed the grinding elements outwardly according rto this predetermined Vsetting. .y i i My` invention is also 'characterized by the provision `of grinding elements supported upon a tool body .for outward radial adjustment, which body carries rotatablegear `rollers :extending lengthwise thereof and coupled withjstuds engaging the abrasives to. radially adjust the abrasives upon rotation offthe gear rollers; An adjustable gear collar surmounts them upon its rotation.

the ybody andy engages the rollers .to actuate bodiment of my invention...fr :1

. Fig. lis aside .elevation ofa preferred eml O lierv important .features and i Fig. 2 is-a vertical sectional view through anembodimentof my invention. :j Y

. Fig. 3 is ahorizontal sectional'vievv taken on'the line3`3 of Fig. 2. i 'f Fig. l is a horizontal `sectional view taken on-thelinel-v-i'ofliig. Fig.5 is avertical sectional view taken .on the line57-5 ofFig. 2 and l i Fig.I .6 is .a-yfragmentary sectional viewthrougha modified formofmy invention. In the drawings,.let 1 0 indicate the driven spindleofapower machine which isfcoupled with ya grinding tool through a universaljoint formed .byv interfittingbearing elements 12 andM, connectedfwitha .spindle by thepin a '16. The element 14 isfcoupled with a driving .collar 18 byscrew studs 2O,l theinner reduced endsgofyvhichare Lseated in angular grooves 22 forming abayonet.jointfeft'ectwliich permits ready interlocking of thetool `'with the 70 spindle. l M The tool body 24 carries Athe@abrasiveor grinding elements 26 t'ofrotate therewith land 'i in such a manner as to permit the radial-adjustment thereoftoivary .the grinding di- )I5 arneter.. Three of these grinding elements arehere shown, each in'c'ludingan abrasive 'I stone mounted ina suitable channelbac'klsup.` port. The back support 'of each stoneis pro vided a pair of'studs 28`whicheXtle'nd vthrough transverse openings. formed f in lthe 1 bodyr24. These studs are: notched asV at 30 to beengaged by gearrollers 32.l that extend lengthwise through the bodyQandare rotat-- ably .supported therein sothat rotation of 85v i the rollers advances or withdraws'the studs' j e' to carry theabrasives. e v n Three ofthe abrasive elements are shown in the illustrative .embodiment andthree of the rollers areshown asextendinglengthwise' 90 Y through thebodyl and the body itself is shown as'being ofla hexagonal shape. .Thebodyis formedat its `upper end withi'a shoulderand at this. shoulder the' rollers project beyond the'fdiameter ofthe bodyffornengagement 9e Y Y with the gear teethtfof an adjustable rgear e I lcollar/,.36 `which surmounts the bodyso'that rotation fof the collar causes rotation of the rollers and movement ofthe abrasives. A

plate is Vsecured by a'scre stud to theflog bottom of the body to hold the parts in place.

The collar 36 has a cored out portion 40 within which is seated a coil spring 42, the lower lend 44 of which is seated within a socket formed in the collar and the upper end 46 of which is seated within a socket formed in the driving collar or driving part 18, as

shown in Fig. 2. The tool body has a re-` Y duced vend portion 48 whichextends up@ the tool body is similar to that heretofore dewardly through the adjustableggear collar- 36 and through and into the driving collar v18, and a plate 50` is seated within the driving collar 1-8Vand'is attached by a screw Y stud-52 to the tool body` to hold the driving collar to the body.

yThis upper extension 4K8 of the Vbody is provided `with a plurality of sockets 5.4 which are shown in Fig. 3 and which cooperate with a drivingL stud 56 that isV threaded through a housing 58 carried by a ring 60 which encircles thedriving col'lar.` A drivin'gcollar 18 -is fcut' away at .its lower endas shown in Figs and 5 andas indicated at 62 so that while the'driving collar drives the tool body through engagement of. aface 62 with the housing 58 through which the screw stud 56 extends, when such stud is engaged in one of the recesses'54, it permits overrunningrotation and a lost motion rotation of the driving collar with respect to thebody as determined by the extent of the cutaway portion of the collar and the position of the driving stud 56 in y'one of the apertures 54. z

ThisV permitted extent of lost motion or overrunning rotation is utilized to tension the spring 42 which in turn tensions the adjust- `ablecoljlar36 to feedthe abrasive elements outwardly.. during the grindin-g'-operation as now set forth. j In the operation of the device the adjustable collarinay'be rotated to bring the abrasives up normally to a diameter approaching the diameter ofthe cylinder bore to be ground s and upon. thefirsft impulse ofV power -rota` tion-"imparted through `'the spindle 10 there isa normal tendencyjforthe abrasives 'to move outwardly into frictionalr engagement with the cylinder wall. The setting of the driving screw 56 will be such that aperm'itted motion of rotation is provided for. Upon frictional engagement of the abrasives with f the cylinder wall the rotation ofthe tool body is resisted andthe driving collar18 overruns the body until a face -62 engages the housing ,58, of the. screw 56 and during this overrun-Y `ning movement thefspring'42 is tensioned which places a force uponthe adjustable collar 3 6 tending to rotate Vit tofeed the abrasives outwardly and which tension ofthe spring is utilizedto feed vthe abrasives outwardly during the grinding voperation and as wear occurs.f I t will therefore appear that withthis tool the device maybe so set as to provide yfor a determinedV feeding ofthe abrasives radially during the grinding operationland'that Vhat .Il claim:

` with respect to the body.` i

navieras scribed but the adjustable gear collar indi r cated as V136 and coupled by the spring 142 with theV driving collar 118 is tensioned by manipulation of thecollar 118 about the periphery of the upper extension 148 of thetool body. This rotatable adjustmentof the part 118 is determined by corrugations 150 vwhich y seat an adjustment pin 152 held inwardly by a spring 154;V The tension spring 142 may therefore be tensioned as desiredtoexertthe' desired thrust upon thev gear collar 136 and during the grinding operation .this thrust tends to feed the abrasives-'outwardlyas'heretofore described. y

1. 'A grinding tool having, in combination, a body, abrasives A carried thereby to'rotate therewith and radially adjustable with re-A spect to the body, a driving part coupled with the body through a lost motion connectionto drive the bodydirectly upon the taking up of said lost motion,` adjustment mechanism including a rotatable member coupled with the abrasives to adjust their grinding diameter upon rotation of the member and a yieldable element coupling the member withl the driving part to be tensioned during the lost. motion movementV o f'said part in picking up the body for rotation to'urge said'membe'rrotatably...v

2. A tool ofthe character described com-1 prising, in combination, a body, grinding ele"-V ments carriedby the body and movable radially to adjusted positions, a driving s part coupledY with the body through la lostfmotio'n connection to rotate the body, ustment 'mechanism coupled with said abrasivestoac# .no i

tuate them'radially and including an adjust-l able collar arranged intermediate the drive ing part and the body and means responsive to the lost motion rotation of the driving part adjustment collar tending to.V urge said abra#V aan abrasives vto vvary the radialV position Vthereof with respect to the body,' an' adjustable' mjem-V Y ber coupled with saidj gear elements, fadriving party coupled withy the body and ,a-yieldable. element coupling said 4driving part ywith-th adj ustable' member to'placel a ltension thereon upon relative :rotation of the drivingpartl `1`15 Y relative to the bdy toi place a; tensionr on said Y feo 4. A grinding tool having, in combination, a body, a plurality of abrasives extending lengthwise thereof and rotatable therewith and adjustable radially with respect thereto, a plurality of gear elements extending length- Wise through the body and rotatable therein and coupled with said abrasives to adjust their radlal position with respectto the body, l a rotatable collar coupled with said gear elements to rotate the same, a driving part coupled with the body to rotate the body, a spring coupling said driving part with the collar to permit relative movement of the driving part with the collar to place a tension on the collar tending to urge said abrasives outwardly to increase their grinding diam-l eter.

In Vtestimony Wheref, I, FRANK p J. Jnsomn, signthis specification.

FRANK J; JESCHKE. 

